题目

在“测定金属丝的电阻率”的实验中，待测金属丝的电阻Rx约为3Ω，实验室备有下列实验器材： A．电压表V（量程3V，内阻约为3kΩ） B．电流表A（量程0.6A，内阻约为1Ω） C．滑动变阻器R（0～10Ω，额定电流0.5A） D．电源E（电动势为3V，内阻约为0.3Ω） E．开关S，导线若干 （1）为减小实验误差，应选用图中 （填“甲”或“乙”）为该实验的电路原理图． （2）现用刻度尺测得金属丝长度为60.00cm，用螺旋测微器测得其直径示数如丙图，则直径为 mm．图 完形填空 　　In the United States, students need more than good grades to impress teachers and employers．They also need to 　　1　　 social and practical experience．Many students do this by 　　2　　 clubs．These clubs can be related to academics or recreation, everything from math to chess and music． 　　Students 　　3　　 seek internships(实习)and jobs．Internships usually do not pay, but they help students learn more about a 　　4　　 that interests them．For example, students who are interested in politics 　　5　　 to work on a local politician’s campaign． 　　Students are often taking stress．They are 　　6　　 running from class to club, to community service, to internship, to Starbucks and 　　7　　 to class again and again and again．These experiences also give students 　　8　　 contacts inside a particular industry．They often get letters of recommendation and win more employment 　　9　　．However, extracurricular responsibilities can affect students’ 　　10　　 in the classroom．If they are not very organized, they can easily become lost in their schoolwork and overwhelmed with pressure． (1) [　　] A． learn B． gain C． win D． serve (2) [　　] A． attending B． opening C． contacting D． joining (3) [　　] A． also B． either C． never D． ever (4) [　　] A． subject B． society C． lesson D． field (5) [　　] A． pretend B． volunteer C． continue D． expect (6) [　　] A． fast B． busy C． active D． right (7) [　　] A． thus B． forever C． often D． then (8) [　　] A． valuable B． formal C． remote D． regular (9) [　　] A． relationship B． friendship C． opportunities D． campaign (10) [　　] A． homework B． assignment C． performance D． understanding